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Family: Asteraceae Scientific name: Ambrosia species Description: Plant Form Perennial herbs. Size Up to 2 m tall. Stem Erect, somewhat woody. Leaves Deeply divided. Fern-like. Have strong aroma. Flowers Greenish-yellow cup-shaped flowers along long spikes. Fruit and Seeds Black, small, rough seeds. Habitat Pastures, roadsides, forests, riparian areas.